Who is Carter Page, the Trump ex-adviser at the center of the memo furore?

The memo describes how the FBI conducted surveillance on Page, who was a foreign policy adviser on Trump’s campaign

He is the mysterious aide who just won’t go away: at the center of the furore over a controversial memo Donald Trump green-lit for release on Friday is Carter Page, who once served as a foreign policy adviser on Trump’s presidential campaign.

The so-called Nunes memo, named for House intelligence chairman Devin Nunes, describes how the FBI sought and received a warrant to conduct surveillance on Page, whom the bureau had been following since at least 2013, owing to his contacts with Russian intelligence operatives.

The memo was written by aides to Republican​ Devin Nunes, chairman of the House Intelligence Committee, a staunch defender of Donald Trump and member of Trump’s transition team. The committee is investigating Russian interference in the 2016 election, but the inquiry has devolved into a partisan fight about the ​separate FBI investigation​, now​ led by special counsel Robert Mueller​.